Implementation code of PHP observer pattern_PHP tutorial

The code is as follows:

Copy the codeThe code is as follows:

//Inspected or abstract class
class Observed implements SplSubject{
protected $_name;
protected $_observers;

//Instantiate, generate an observer object
public function __construct(){
$this->_observers = new SplObjectStorage();
}

// Add observer object
public function attach(SplObserver $observer){
$this->_observers->attach($observer);
}

//Delete the observer object
public function detach(SplObserver $observer){
$this->_observers->detach($observer);
}

//Notification message
public function notify(){
foreach($this->_observers as $observer){
$observer->showMessage($this);
}
}

//Normal method: Set value
public function setName($name){
$this->_name = $name;
$this->notify();
}

//Ordinary method: Get value
public function getName(){
return $this->_name;
}

//Normal method: set age
public function setAge($age){
$this->age = $age;
foreach($this->_observers as $observer){
              $observer->showAge($this->_name,$this->age);
                                           
}

// Observer abstract class

class Observer implements SplObserver{

//Show message prompt

public function showMessage(SplSubject $obj){

$user = $obj->getName();
if($user==='admin'){
Echo 'Hello,', $ user, 'Welcome to enter the management background & lt; br/& gt;';
} else {
echo "Hello, '$ user' you have been added to User list
";
}
}
//This is an abstract method that inherits from the parent class
public function update(SplSubject $subject) {}

//Show personal age

public function showAge($name,$age){

echo "<script>alert('$name's age is: $age')</script>" ;
}
}

$subject = new Observed(); //Generate an observed object

$observer = new Observer(); //Generate an observer object

$subject->attach($observer) ;//Pass the observer into the observed
$subject->setName('Zhang San'); //Call the setName method
/*
* It will be called through the setName above $this->notify();
* By calling $this->notify(), the $observer->showMessage($this) method will be called,
* which is the showMessage of each observer object ($obj) method;
*/
$subject->setName('admin');
$subject->setAge(24);

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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/326995.htmlTechArticleThe code is as follows: Copy the code The code is as follows: //Observed abstract class class Observed implements SplSubject{ protected $ _name; protected $_observers; //Instantiate, generate an observer...